Oh I see your line of thought. Sounds like overengineering to me though - one consequence leads to the next, and soon enough the whole system becomes cumbersome. Actually... the guest connections might work by themselves. Sure some people will sign up to meaningless accounts, but putting up barriers like that drains the energy out of people, kind of like institutional barriers stopping certain demographics from achieving in real life. Might be the lesser of the two evils, but we'll need to get numbers for that.